In practice, this means 2×80 watts into 4 ohms, or 2×40 watts into 8 ohms, which is more than enough for most bookshelf speakers or smaller floorstanders. The 0.005% THD+N figure and 103 dB signal-to-noise ratio show that the A100 is not only capable of getting loud, but also precise. The sound signature is essentially neutral: it does not overemphasize the bass, and it does not artificially “sparkle” the treble. Instead, it lets the source and the speaker’s character speak for themselves.

The built-in Bluetooth 5.0 receiver uses its own antenna, providing a stable connection and better transmission quality up to around 10–15 meters. This is ideal for listening from a phone or laptop when you do not want to deal with cables.

If you want to play music directly from a computer via a digital connection, there is a driverless USB audio input. Simply connect the included USB cable and the system will recognize the A100 immediately, without any additional drivers. The unit supports common formats, so playing MP3, WAV, or FLAC files is straightforward. The analog RCA input offers a convenient option for classic hi-fi sources such as an external DAC or a CD player.

On the rear panel of the A100, you will find two subwoofer pre-outs with identical function. These allow you to expand the system with an active subwoofer in either a 2.1 or 2.2 setup. If the subwoofer has a “Sub In” or “LFE In” input, the A100 sends bass information to both the main speakers and the subwoofer at the same time. The result is fuller low-end extension, while the mid and high frequencies remain detailed. This is especially useful with smaller bookshelf speakers, where a dedicated subwoofer can noticeably improve the overall presentation.

Inside, a low-noise, high-performance switching power supply designed specifically for audio use provides stable, consistent power delivery. Carefully selected “audio grade” components are used in the signal path, and the inputs and outputs are gold-plated for better contact.

The control interface is intentionally simple. On the front there is a large analog volume knob, and on top separate mute and input selection buttons. No complicated menus, no screens everywhere. You turn it on, select the input, adjust the volume, and you are done. Built-in protection circuits monitor overheating and overcurrent, so the device remains safe to use even over longer sessions.

Amplifier architecture

Class-D, Infineon MA12070

Output power

2×80 W (4 Ohm) / 2×40 W (8 Ohm)

Total Harmonic Distortion (THD+N)

0.005%

Device

1 × SMSL A100 amplifier

USB cable

1 × factory USB cable

Power cable

1 × factory power cable